One look, less baggage

This first housekeeping pass removed the visible selector and much of the retired presentation. A deeper follow-up audit found additional fallback styling, server plumbing, native preferences, and skipped tests, which version 5.7.0 removed.

• The visible presentation selector was removed.
• Emails, receipts, and public pages moved toward one template family.
• The remaining cleanup was tracked to the complete single-design release.

The Dawn experience itself did not change.